Finding the Fourth Proportional to 3,100.76, 4,651.79 and 909.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,100.76 : 4,651.79 = 909.31 : x
2. Step 2: Convert to fraction form
   3,100.76/4,651.79 = 909.31/x
3. Step 3: Cross multiply
   3,100.76x = 4,651.79 × 909.31
4. Step 4: Simplify right side
   3,100.76x = 4,229,919.16
5. Step 5: Solve for x
   x = 4,229,919.16/3,100.76
6. Step 6: Final answer
   x = 1,364.16